Fixed #20585: normalize signature of DeletionMixin.post.

        return HttpResponseRedirect(success_url)

    # Add support for browsers which only accept GET and POST for now.

    def post(self, *args, **kwargs):

        return self.delete(*args, **kwargs)

    def post(self, request, *args, **kwargs):

        return self.delete(request, *args, **kwargs)

    def get_success_url(self):

        if self.success_url: